Electrical plug



Noy- 1929- N. c. GREENE 735,856

ELECTRICAL mm Filed may ,-192e 2, Shets-Sheef 1 ATTORNEY? Nov. 19, 1929. N. QGREENE- 1,735,856

ELECTRICAL PLUG Filed May 19. 1926 2 Sheets-Sheet 2- Patented Nov. '19,- 1929 1 UNITED STATES Lhasa;

PAT

E'Nr orrlca im'r miunnc. GREENE, or new YORK, N. Y., ASSIGNOR T rornmr MANUFACTURING CORPORATION, A conronn'rron on NEW YORK ELECTRICAL PLUG Application file'd May 19,

This invention relates generally to electrical plugs of'the telephone type adapted for use in connectionwith radio 'receiving sets or telephones to improve the quality of the tone 5 reproduction at the' loud speaker or head phones; the plug being'so constructed to re across the terminals of the plug. This condenser improves both the high and low notes of the musical register by broadly increasing the audio frequency range. The condenser also by-passes the'stray radio frequency cur- ,rents which pass .overinto the audio stages of the; set and also prevents the pulsating current obtained from faulty fB batteries from passing through the speaker unit;

thereby eliminating the cracklingand other foreign .noises due to these stray currents which are greatly amplified by the loud speaker and cause poor reproduction.

By inserting the condenser in the body portion of the plug, I accomplish the results im mediately which would otherwise require cohsiderable changes to be made in a large percentage of the radio sets in use to-day as they are so enclosed and constructed to practically necessitate taking the set apart to insert the condenser in the hook-up; and if the set were accessible, the average layman would not know where the condenser was to be attached nor would he know how to attach itL' I 'My improved phone plug alsoprovides for the possibility of operating a plurality of loud speakers or sets of head phones. This provision is made by providing the body pottion of the plug with binding posts which are in contact with the condenser connections.

One of the objects of my invention is to provide a radio phone plug which. will improve the quality of the tone reproduction. Another object of my invention is to increase the audio frequency range of a radio receiving set and thereby improve the high and low notes of the musical register? 1926. Serial No. 110,080.

Another object of my invention is to eliminate the stray radio frequency currents and prevent the pulsating current from faulty B batteries from passing through the speaker unit,'

Another object of my invention is to pro vide a radio phone plug with means for attaching more than one loud speaker or sets of head phones. 0

Another object of my invention is to provide a radio phone plug having a condenser located within its body portion and connected across its terminalswhich will improve the reproduction at the loud speaker or head phones, and which will eliminate the necessity of taking the receiving set. apart or dismantling it to any extent to obtain the im-' proved reproduction. A

A further obj ect'of my invention is to provide a radio plug which will improve the reproduction and which is adapted to receive a plug terminal connection connected to the lead Wires of a loud speaker orhead phone.

A further object of my invention is to provide a' neat, simple and inexpensive device which will be attractive in appearance, durable and not subject to excessive strain or wear, and which entirely encloses a condenser and phone jack in av body portion of insulat ing material.

With these and other objects in view, to be more fully set forth hereinafter, the invention consists in the novel construction, com-' plan view of my improved radio 2 1 meters Fig. 3 is a plan view of the lower half illustrating the relative position of the parts,

Fig. 4 is a sectional View taken on the line 4+4 of Fig. 1,

- Fig. 5 is a sectional view the same as Fig.

{illustrating two typesof loud speaker or head phone connections,

Fig. 6 is a sectional view taken on the line 6-6 of Fig. 1,

Fig. 7 is an end view looking in the direction of the arrows 7- 7, 'Fig. 1, and

Fig. 8' is a central sectional view of a modified form of my invention.

Referring to the drawings, the body portion of my improved plug consists of the two which can be molded. Each of the halves (See Fig.

of the body portion have the recesses or depressions- 3 molded in them to form the chamber 3 when assembled and securely held in position by the countersink screws 4.

' Located in suitable depressions in one end of-the halves forming the body portion is the plug terminal assembly consisting of the terminals 5 and 6 which are insulated from one another by the washers 7 and 8. Securely held at one end of the terminal.assembly and in electrical contact with the terminals 5 and 6 but insulated from each other by the washer 8, is the spring contact 9 and the terminal connector 10 respectively, to both of which is securely fastened the condenserllby means of the bolts 12.

The binding posts 13 and 14 are centrally located in suitable holes molded or drilledin the two halves 1 and 2 forming the body .portion'which are securely held. in position y the threaded washers 15. The holes 16 drilled in said binding posts 13-and leprovided 'for the reception of azsecond pair of lead wires for a loud speaker or head phones, (see Fig. 5), said wires being provided with metal tips 17 which are held in osition by screwing down on the knurled t iumb nuts 18. Lead' wires from a-second loud speaker or head phones not having metal tips are held in the usual manner of binding the bared ends around the binding post and then screwing down the thumb nut. The contact 55 button of the binding post 13 is in contact with the contact spring 19 which is held in position by one of the bolts 12. To increase the strength of the spring contact 9 and to insure perfect contact between the binding post. and the contact spring 19, said contact spring 19 is of such length to form a sliding contact near the end of the spring contact 9 to allow for deflection when the loud speaker or phone plug 20 is pushed home as illustrated in Fig. 5. The connector 10 is so formed to be in electrical contact with the binding post 1a. The angle piece 21 carries the contact collar 22 which is centered by suitable depressions in the halves 1 and 2. lvith the arrangement of parts as illustrated it will be readilyseen that an electrical current coming in through the plug terminal 5 will pass through the spring contact 9 and into the plug terminal 5 of the plug 20 which is a similar terminal and the current returning will pass from the terminal 6 through the contact collar 22, the angle piece 21, the connector 10 and into the terminal 6; the condenser 11 acting as a by-pass for stray radio frequency currents and also'prevents pulsating current from faulty B batteries from passing through the loud speaker or head phones. i

Referringto the modified form as illustrated in Fig. 8 it will be seen that thebinding posts 13 and 14 have been eliminated, thereby making it a single connection plug. The elimination of the binding posts also eliminates the contact spring 19 and allows a more simplified form of connector 10 to be used; all of which tends to decrease the.-- cost of production.

Inaccordance w th the provisions of the patent-statute, I have described my invention but I desire it understood that it is not con- 5 fined to the particular form shown and described, the same being merely illustrative. and that the invention can be carried out'in other ways without departing from the spirit of my invention, and therefore, I claim broado lythe'right to employ all "equivalent instrumentalities coming within the scope of the appended claims, and by means of which, ob-

jects of my invention are attained and new results accomplished; as it is obvious that the particular embodiments herein shown and described are only some of many that can be employed toattain these objects and accomplish these results.

Having now'described my invention what no I claim and desire to secure by Letters Patent 1s f 1. In a device of the character described, a hollow insulating casing, a collar embedded inthe end wall of said casing and extending from the exterior to the interior thereof, a bracket secured to the interior end of said collar and supported thereby within said casing but spaced from the side walls thereof, and

means at the opposite end of said bracket for supporting a'radiov condenser of the square block type within said casing but spaced from the walls-thereof and from said collar.

2. In a device of the character described, a

hollow insulating casing of flat, generally rectangular formation, a collar embedded in the end wall 'of said casing and extending from the exterior to the interior thereof, a bracket secured to the interior end of said collar and supported thereby within said casing, said bracket being of L-shape formation with one limb surrounding said collar and the other limb extending along a side Wall. of said casing, close to but spaced from said Wall, and means carried by'the extremity of said last mentioned limb for supporting a radio condenser of the square block type Within said casing, but spaced from the side Walls thereof and from said collar.

m 3. In a device of the character described, a

hollow insulating casing of fiat, generally rectangular formation, a cylindrical conducting collar embedded in and extending through an end Wall ofsaid casing, a jack plug embedded in and extending through the opposite end Wall of said casing, a bracket of conducting material secured to the inner end of said collar and supported thereby within said cas mg, said bracket being of L-shape formation with one limb surrounding said collar and the other limb extending along a side Wall of said casing, close to but spaced from said Wall, and an attachmentdeviee carried by said last mentioned limb, said attachment device being adapted to engage the eyelet of a radio condenser of the square block type whereby said condenser is supported Within but free of the Walls of said casing and in electrical connection with said collar. This specification signed this 17th day of May, 1926.

NATHANIEL C. GREENE. 

